The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 1991
Filed:
Jun. 05, 1989
Applicant:
Inventor:
Toshinobu Suzuki, Hachiouji, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350414 ; 350478 ;
Abstract
An objective lens for microscopes comprises a first lens unit, a second lens unit which is movable along an optical axis, and a third lens unit. The second lens unit includes elements of a compound lens component cemented to each other to dispose an optical modulator consisting of an annular phase diaphragm on their cemented surface. The objective lens is capable of canceling variation of aberration caused by a thickness of a cover glass and bringing about a modulated image with favorable contrast.